Published online by Cambridge University Press: 01 January 2025
The proof of the existence of “g” is more than a methodological problem and concerns the very core of psychological theory. The principles of noegenesis should be identified experimentally before a final opinion can be rendered about “g.” Many general factors isolated in different studies are not necessarily “g.” In the present study a second-order unrotated general factor has been identified by using Thurstone's method. It seems possible to identify this factor with “g.” In the first order, factors that seem to represent the first and second principles of noegenesis have been found. The existence of synthetic and analytic activities and their interplay in intellectual performances is indicated. The relation of likeness is of great interest in explaining cognitive abilities and is isolated both as a first and second order factor. For the final identification of factors the search should be conducted beyond the elementary listing of tests. The dynamic aspects underlying factors are more meaningful than their simple description. The second order gives indications that allow for a better interpretation of fundamental psychological activities.
The final part of this study was carried on at the Psychometric Laboratory, University of Chicago, during the year 1946—47. This part of the research was completed under a State Department Grant and a Frank Fund Fellowship.
The author is indebted to Dr. L. L. Thurstone for his assistance and to Mr. V. S. Tracht for his help in preparing the manuscript.
As described by Spearman the principles of noegenesis refer to: 1) “a person has more or less power to observe what goes on in his own mind,” 2) “when a person has any two or more ideas (using this word to embrace any items of mental content, whether perceived or thought of), he has more or less power to bring to mind any relations that essentially hold between them,” and 3) “when a person has in mind any idea together with a relation, he has more or less power to bring up into mind the correlative idea” (27). The theoretical postulation and a complete discussion of these three principles is found in The Nature of Intelligence and the Principles of Cognition (25).